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Патент USA US2105049

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Jan. 11, 1938.
A. N. LUNGREN
25105049
PEN
Filed Oct. 19, 1935
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22
[7206/271* 1
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hug/ran,
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Patented Jan. 11, 1938
2,105,049
UNITED STATE s
PATENT OFFICE’
2,105,049
PEN
‘Arthur N. Lungren, Eva-union, Ill, “Signor to
The Wahl Company, Chicago, 111., a corpora
. >tion of Delaware
Application October 19, 1935, Serial No. 45.116
.
Ill-Claims.
(Cl. 120-109)
This invention relates to improvements in pens,
and more particularly to improvements in pen
points for fountain pens.
»
may be manufactured with the desired accuracy
in a comparatively simple manner.
'
Yet another object is the provision of an im
In order for a pen to start writing immediately . proved pen point construction which will main
5 it-is applied to the paper, there must be ink at tain theidesired tension of the nibs without sub
the extreme tip end portion of the pen point jecting their delicate tips to distortion.
‘ A further object is the provision of an im
which touches the paper. In writing pens, the
vslit between the nibs of the pen point constitutes proved pen point construction which will very
a channel for conducting ink- to the tip and, if largely eliminate likelihood of distortion and
10 the pen point is properly “set” in a fountain pen, overlapping of the nibs from lateral pressure in
this slit may function to retain the necessary
writing.
Still another object is the provision of an im
proved pen point construction. in which the ?ex
point he set with the tips of the nibs slightly ibility of the nibs may be varied selectively with
15 spaced apart, in order to afford a crevice for out varying- the relationship of the nib tips conse
retention of the ink. In fountain pens, such a quent upon slight structural deformation of the
set of the nibs is customarily accomplished by pen point.
?xing the pen point in such relationship to the - Other and further objects will be pointed out or
feed bar, which underlies it, that the nibs, by indicated hereinafter, or will be apparent to one
20 contact with the feed bar, are slightly tensioned skilled in the art upon an understanding of the
ink immediately at the tip. In order to function
in this particular, it is necessary that the pen
or sprung upwardly, so that they are slightly sep
arated at the tips. This setting of the pen point
is a delicate operation in the assembling of the
pen, and involves very accurate positioning of the
‘
25 pen point and feed bar.
It frequently occurs, incident to use of the pen,
that the proper set of the nibs is destroyed. This
may occur through habitual ,writing with the pen
in a laterally canted position, as a result of which
30 the nibs are subjected to unequal pressures or
more or less lateral pressures. Sometimes it may
be caused by writing with the pen point in an
inverted position, as is sometimes done in mani
folding with carbon paper. Sometimes the set is
35 destroyed by slight distortion of the pen point or
invention or its use in practice.
For the purpose of aiding in an explanation of
the invention, I show in the accompanying draw
ing forming a part of this speci?cation, and here
inafter describe, certain pen point constructions 25
in which it is embodied in di?'erent forms. It
is to be understood, however, that these are pre
sented merely for purpose of illustration and are
not to be regarded as exhaustive of all of the pos
sible structural forms in which the invention 30
may be embodied, and are not to be construed in
any fashion calculated to limit the appended
claims short of the true and most comprehensive
scope of the invention in the art.
In this drawing,
35
Fig. 1 is a top view of a portion of a pen point
of the feed bar due to temperature changes or in
ternal strains in the material of which they are embodying the invention in one form;
Fig. 2 is a bottom view of the same embodi
made.
'
One of the objects of the present invention is - ment;
Fig. 3 is a sectional view on approximately 40
40 ‘the provision of an, improved pen point con
line 3-3 of Fig. 2;
‘
V
struction, particularly adapted to use in foun
Fig. 4 is an end view looking at the tip ends of
tain pens but not limited thereto for its advan
the nibs;
'
tages, which will be effective to maintain a prop
Fig. 5 is a side view of the embodiment illus
erly spaced relationship of the tips of the nibs
‘v g 45
4 for obtaining the e?ect above indicated,>entirely trated in Figs. 1 and 2;
Fig. 6 is a bottom view of a portion of a pen
independently of associated parts such as the feed
bar.
1
Another object is the provision of such a pen
50 point which is- adapted to function properly in
a fountain pen without involving the accurate
setting of the pen in the particulars above men
tioned.
Another object is the provision of a pen point
55 having the attributes just speci?ed and which
point embodying the invention in another form;
Fig. '1 is a section on line 1-1 of Fig. 6; and
Fig. 8 is a top view of a pen point con
taining the embodiment shown in Fig. 6. and fea- 50
tures for effecting selective variation of the ?exibility of the nibs.
,
‘
.
Described generally, the invention provides a/
pen point having collaterally arranged resilient
nibs which terminate in writing tips, said nibs 55
2,105,040
being separated by an intervening slit leading
from a pierce in the body of the pen point at the
upper e ‘ds of the nibs. The nibs have portions
which co tact each other at a slight distance from
the writing tip under the inherent resiliency or
tension of the nibs, while at the tip, and for a
slight distance upwardly therefrom, the nibs are
spaced apart from each other to afford a narrow
ink-holding slot or crevice. The tips are pre
10 vented, by their mutual contact above such slot,
against closing together, and are formed to pro
vide an ink-conducting channel past their mu
tually contacting portions, to accommodate and
induce ?ow of ink to the tip slot from the portion
15 of the slit above the mutually contacting por
tions. By such construction, the nib tips are
l8, and it preferably extends to the welded-on
portions of the tip, when such are employed.
Depending on the ?exibility of the nibs and the
amount of pressure exerted upon the pen by the "
user, the nibs may be spread or separated more
or less in the use of a pen in writing, or the nibs
may not be spread or separated in the contact
area I‘! at all. In whichever way the pen is used,
however, the construction affords a continuous
and e?ective channel for ?ow of ink to the writ
ing tip where it contacts the paper, and, when
the writing is discontinued, the tip slot I 8 re
tains an appreciable quantity of ink immediately
at the writing point so that ink will be deposited .
on the paper immediately the tip is again ap
plied thereto.
maintained in properly spaced relationship while
The embodiment illustrated in Figs. 6 and 7 _is
at the same time the nibs may have the desired
inherent inward or downward tension.
The‘invention will ,be understood in more de
20
tail from the illustrative embodiments shown in
one wherein the same effects and advantages are
the drawing, which will now be described.
_
In the embodiment illustrated in Figs. 1 to 5
inclusive, the pen point has a body portion ill] of
25 more or less conventional form, which is raised
in arched contour, the nibs H being formed in
tegrally therewith and tapering to narrow writ
ing tips l2. The body is formed with the pierce
it from which the slit l5 leads to the tip. The
30 end portions of the nibs may be formed of a suit
attained, but which can be manufactured by
operations which are simpler and more easily 20
controlled for accurate results. In these ?gures
the reference numerals used in the ‘preceding
?gures are applied to corresponding parts. In
the forming of a pen point of this construction
the medial slit l5’ may be made in uniform width‘ a25
throughout its length, thus simplifying the slit
ting operation. This slit is of the width desired
for the clearance between the nib tips. The'con
tact areas of the nibs are formed by a staking
operation by which portions of the material at
able wear-resistant material, such as iridium,
welded to the body material as along the juncture
the upper side of the nibs are displaced inwardly
to provide lands 24 which contact each other.
line
These are located a'slight distance above the
56.
_
.
The slit l5 preferably tapers or converges from
ends of the tips, and maintain the nibs spaced
the pierce M to a'location slightly above the writ
ing 'tip, at which location the nibs contact each
other laterally as at IT. The nibs have the de
sired inherent resiliency and an inherent tension
apart in the desired relationship. The portions of the material under the lands are not displaced,
thus leaving a channel 25 as a connection between
the rearward and forward portions of the open
or set whereby they maintain themselves in con- -
slit 55’, said forward portion constituting the
ink-retaining slot between the tips of the nibs.
, tact with each other at ‘location l1. At the tip
of the pen point, and for a slight distance up
wardly therefrom, the adjacent margins of the
nibs are cut away so as to afford a tip slot ill,
the margins of the nibs which de?ne this slot
45 being approximately parallel. Due to the abut
ment of the nib margins at location II, the tips
are prevented from closing against each other,
the tip slot “3 thus being maintained as a crevice
or clearance between them. This clearance
50 preferably is extremely slight, e. g., .001 to ‘.002
of an inch, but is adequate to retain, by capillary
action, a ?owable quantity of ink. The tips are
ground so as to debouch this clearance on
smoothly curving lines, as indicated at l2a in
55 Fig. 2, and they are somewhat thicker than the
body material and smoothly rounded oil? on their
lower and upper surfaces, to form a writing point
substantially as illustrated in Figs. 4 and 5. This
formation may be such as to provide a relatively
60 wider ink-applying surface on the under side of
the tip, as indicated at I 9 in Fig. 4, and a rela-,
tively narrower ink-applying surface on the‘
upper side, as indicated at 20. This is to permit
use of the pen in either the normal or the in
verted position, with production of a finer line
in the latter.
As seen in Figs. 2 and v3, the adjacent marginal
It will be understood that in the drawing the
width of the tip slots is somewhat exaggerated
in proportion to the size of the pen point, for‘
purpose of clarity of illustration.
In Fig. 8 is illustrated a pen point having the 45.
features of construction illustrated in Figs. 6 and
7 and equipped also with means for accomplish
ing a selective variation in the ?exibility of the
nibs. This adjusting means constitutes the sub
ject matter of the patent to Robert Back No. 50.
1,980,159, granted November 6, 1934 to the as
signee of this present invention. In addition to
having the nibs formed. and positioned as above
described, this pen point is provided with parallel
slots 26' which extend for a distance in the body 55,
‘portion l0 and forwardly into the nibs on oppo
site sides of the medial slit. An adjusting mem
ber 21, of relatively stiff or rigid quality, ?ts upon
the upper surface of the pen point and has down
' wardly extending lugs 28 ?tting slidably in said 60
slots, the lower portions of the lugs being bent
outwardly below the pen point to hold the ad
lusting member thereto. The adjusting member
has a converging nose portion 21a which extends
forwardly from the lugs and also rides in contact 65
with the ‘upper surface of the nibs. The adjust
ing member may be slid forwardly or rearwardly
on the pen point, the lugs riding in- the slots 26,
portions of the nibs are chamfered or beveled. off . and it has a detent portion adapted to engage in
on
their
under
sides,
as
indicated
at
2|,
to
form
70
any of a series of seats 29 formed on the upper 70.
a channel 22 running along the medial slit. This surface of the pen point, for the purpose of re
channel extends past and both forwardly and taining the adjusting member in the selected po
rearwardly beyond the nib contact area l1, and ~
serves as av communicating passageway for ink
75 from the open portion of the slit I 5 to the tip slot
sition. The nose 21a and lugs 28 impose limita
tions on the ?ection of the nibs, and by moving
the adjusting member forwardly toward the tips
2,105,049
3
of the nibs, the proportion of the nibs susceptible
nal channel passing under their area of contact
and communicating with the slit and the slot.
5. A pen point comprising a body portion
lines is shown the forward limit position ‘of the
formed with collaterally associated resilient nibs
nose 21a of the adjusting member. The provi
sion of the lands 24 for holding the nib tips spaced which are separated from each other by a medial
slit, said nibs terminating in writing tips, por
apart has a de?nite cooperation with this ad
justing means, in that it prevents the nib tips tions of said nibs being oiiset laterally toward
from being forced together even though the slots each other and contacting for only a small frac
26 may not be exactly parallel or even though tion of the length of the slit, the portions of the
nibs forwardly of said o?set portions being lat
.10 there may be some distortion of the nibs from in
ternal strains or other causes. It will be obvious erally spaced apart from each other.
of ?ection may be reduced as desired.
In dotted
that the nib construction illustrated in Figs. 1 to 4
inclusive, as well as others within the scope of
the invention, may be utilized in combination
6. A, pen point as speci?ed in claim 5 and
wherein the nibs are formed to aiford a longitudi
15 with the adjusting means.
In either of the nib constructions above ‘de
scribed it is desirable that the contact areas of
the nibs extend for an appreciable distance in the
nal channel past said offset portions and com
municating with the slit rearwardly and forward
ly thereof.
‘7. A pen point comprising a body portion
formed with collaterally associated resilient nibs
direction of the nibs’ thickness, thus to maintain
which are separated from each other by a medial
20 the proper contact even though one of the nibs
slit, said nibs terminating in writing tips, portions
may be ?exed upwardly somewhat more than the
other under a writing pressure which is insu?i
cient to separate the nibs laterally. Whether or
not the nibs are completely separatedin the writ
of said nibs being offset laterally toward each
ing operation, the provision of the channel be
neath the contact area affords a suitable feed of
ink to the writing tip. It will also be appreciated
that the present invention obviates the necessity
for extreme accuracy in the set of the pen point
relative to the feed bar in a fountain pen neces
sary to obtain immediate ink ?ow at the writing
tip, and that consequently it is adapted to func-4
tion satisfactorily in spite of the in?uences which
are likely to affect the performance of a fountain
pen adversely in the course of its use.
What I claim is:
l. A pen point comprising. a body portion
formed with collaterally associated resiliently
?exible nibs which terminate in writing tips
in
other and contacting for only a small fraction of
the length of the slit, the portions of the nibs
rearwardly and forwardly of said offset portions
being laterally spaced apart from each other.
8. A pen point as speci?ed in claim 7 and
wherein the nibs are formed to afford a longitudi
nal channel past said o?set portions' and com
municating with the slit rearwardly and forward
ly thereof.
v9. A pen point. comprising a body portion
formed with collaterally associated resilient nibs
which terminate in writing tips, the nibs having
lateral contact with each other for a fraction of
their length but being laterally spaced apart at '
the tips and for a short distance rearwardly
thereof, the body portion and nibs being provided
with longitudinally extending slots spaced lateral
ly from the medial slit, and a still adjusting
which are slightly spaced apart laterally from ,member slidably mounted on the pen point and
having lugs engaging in said slots, whereby the
proportion of the nibs susceptible of outward
said slot to keep the tips spaced apart when the flection may be selectively varied by adjustment
of the adjusting member longitudinally of the
nibs are at their normal tension.
.
2. A pen point comprising a body portion pen point, the contacting portions of the nibs 45
formed with collaterally associated resiliently serving to keep the tips spaced apart from each
?exible nibs which are separated from each other other in all adjustments of the adjusting member.
10. A pen point comprising a body portion
by a medial slit, said nibs terminating in writing
tips which are spaced apart laterally from each formed with collaterally associated resilient nibs
which terminate in writing tips, an adjusting
other to afford an intervening slot, the nibs hav
member adapted for cooperation with said nibs to
ing lateral contact with each other ,for only a hold portions of them against outward ?ection,
fraction of the length of the slit, their area of said adjusting member being adjustable to vary
contact terminating a short distance rearwardly the proportion of the nibs susceptible of outward
from the tips.
?ection, said nibs being laterally spaced apart at
3. A pen point as speci?ed in claim 2 and the tips and for a short distance rearwardly
wherein the nibs are formed to afford a longitudi
therefrom and being in lateral contact with each
nal channel past their area of contact and com
other for only a short fraction of the balance of
their length, their contacting portions being at a
municating with the slit and the slot.
.
60
4. A pen point as speci?ed in claim 2 and short distance from the tips.
60
ARTHUR N. LUNGREN.
wherein the nibs are formed to afford a longitudi
each other to a?ord a slot between them, the
nibs having lateral contact with each other above
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